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Research Papers

Heliostat Field Layout Improvement by Nonrestricted Refinement

[+] Author and Article Information
Reiner Buck

Deutsches Zentrum für Luft-
und Raumfahrt e.V. (DLR),
Pfaffenwaldring 38-40,
Stuttgart D-70569, Germany
e-mail: reiner.buck@dlr.de

Contributed by the Solar Energy Division of ASME for publication in the JOURNAL OF SOLAR ENERGY ENGINEERING. Manuscript received February 23, 2013; final manuscript received August 4, 2013; published online September 19, 2013. Assoc. Editor: Akiba Segal.

J. Sol. Energy Eng 136(2), 021014 (Sep 19, 2013) (6 pages) Paper No: SOL-13-1065; doi: 10.1115/1.4025293 History: Received February 23, 2013; Revised August 04, 2013

A new method for the heliostat field optimization is presented. The method is intended for further performance improvement after initial layout with a standard heliostat field layout tool. During the field refinement, the heliostats are repositioned around their original position, without or with little restrictions. A nonsimplifying ray-tracing tool is used for the performance evaluation. During the optimization, detailed local weather and site characteristics (e.g., topography) can be considered. An example case is presented and discussed. This case is based on a field layout for a plant similar to the PS10 solar tower plant in Spain. In this case, an improvement of the annual intercepted energy into the receiver of about 0.8% was achieved, by slightly repositioning the heliostats. Application of the refinement method is recommended for any future solar tower plant. Basically, the optimization improves the revenues while capital and O&M cost remain unchanged. It is expected that any standard heliostat layout can be improved to a certain degree using this method. The method is very flexible and can be easily adapted to specific situations and optimization goals.

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References

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Figures

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Fig. 1

Field configurations for the selection of initial field (from Ref. [5])

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Fig. 2

Heliostat field improvement with simulation cycles

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Fig. 3

PS10 heliostat field: comparison of initial and refined field configuration

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